What safety operation specifications should be paid attention to in foundation pit construction on construction site?

The safety operations that should be paid attention to in foundation pit construction in construction sites include: the safety of foundation pit support and earthwork machinery operation, the safety measures of foundation pit drainage and electricity consumption, the safety of stacking around foundation pit, edge protection, falling from a height, etc.

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A, earthwork excavation control measures

1. Earthwork construction machinery shall be inspected and accepted by the supervision unit and EPC general contractor (if it is a self-built and self-managed project, it shall be inspected and accepted here by the machinery management department of the construction unit), and the operators shall hold relevant certificates and abide by the safety technical operation procedures.

2, mechanical excavation earthwork, homework personnel shall not enter the mechanical operation radius for pit cleaning or slope.

3, the construction should follow the top-down excavation sequence, it is forbidden to cut off the toe of the slope, and shall not be overbreak.

Second, drainage measures?

1. In the process of foundation pit construction, control the surface water to adjust the drainage measures, and control the surface water accumulation: set open drains along the fence around the foundation pit. In order to eliminate the sudden open water in the rainy season and prevent the drain from leaking, a ponding pool is specially set on one side of the foundation pit, and then the ponding water is pumped into the river by a water pump in time to ensure organized drainage and smooth drainage. ?

2. Drainage measures for foundation pit The water in the drainage ditch above the foundation pit is uniformly discharged to the sedimentation tank around the foundation pit, and then discharged to the rainwater well in the nearby factory.

3. Dewatering measures for foundation pit The exposed water of foundation pit penetrates into the gravel sand layer under the bottom plate, and all of it is discharged by the deep well pump to ensure that there is no water in the foundation pit.

Third, the pit load?

1. Materials piled up at the pit edge, including transportation tools and machinery moving along the excavation edge, should not be too close to the groove edge, not less than 3m away from the upper edge of the pit groove, and mud, materials or tools should not be piled up within the range of 1m at the groove edge. ?

2. It is forbidden to overload around the foundation pit.

3. It is forbidden to pile up earthwork and building materials at the edge of foundation pit, or move transportation tools and machinery along the edge of excavation. The distance between piles and the upper edge of foundation pit shall not be less than 4m, and the height of piles shall not exceed1.5m.

4, all kinds of construction machinery from the foundation pit, slope and pile hole edge distance, should be determined according to the weight of equipment, foundation pit, slope and pile support, soil conditions, stacking shall not exceed the design requirements.

5. When the distance between the construction machinery and the foundation pit and slope is less than the specified distance, take reinforcement measures (such as laying steel plates and sleepers, etc.). ) Foundation pit support and ground within the operation scope of construction machinery.

Fourth, border protection.

1, the limb protective railing adopts steel pipe railing, and the railing adopts φ48×3.5mm steel pipe, which is fixed by fasteners or electric welding.

2. The protective railing consists of two railings and handrails. The ground height of the upper gauge is 1.2m, the ground height of the lower gauge is 0.6m, the total length of vertical rods is 1.7m, the buried depth is 0.5m, and the spacing between vertical rods is 2m.

3, protective railings must be closed with a safety net from top to bottom. ?

4. All guardrails shall be painted with red and white paint with striking warning color, and the interval between red and white paint of steel pipes shall be 20cm. A 4-meter-wide safety passage is set on one side of the foundation pit according to the brush slope, and warning signs such as "Do not climb over" and "Be careful of falling" are hung around the guardrail. ?

5. Around the foundation pit, it should be clearly warned that the piled reinforced materials should not exceed the warning line of 3m at the edge of the foundation pit, and it is forbidden to pile all materials in the warning line at the edge of the foundation pit. ?

6. The foundation pit construction must be carried out according to the requirements, and the specific edge protection requirements shall be implemented according to the control requirements of "three treasures, four mouths and five sides".

7. When the excavation depth of foundation pit exceeds 2m, it is suggested to encrypt the mesh safety net protection on the basis of railing protection.

8. The distance from the front end of the excavator crawler to the excavated pit should be 1.5m, and the muck truck should always wait behind the excavator to load soil, and keep a distance of more than 6m from the slope, so as to eliminate the lateral squeezing force of the construction machinery on the pile and slope. If the parts are particularly fragile, the machine should be covered with steel plates.

9. The excavator shall reserve a soil layer with a thickness of 150mm when digging to the basement and slope at one time, and then adopt manual bottom cleaning, slope trimming and leveling to ensure the basement elevation and slope gradient are correct and avoid overbreak and soil disturbance.

10. After the foundation pit excavation is completed, the bottom should be cleaned in time, the grooves should be inspected, and the concrete cushion should be poured to reduce the exposure time of the foundation pit and prevent the original structure of the foundation soil from being damaged by the sun and rain.

Five, the foundation pit up and down the channel?

1, foundation pit construction workers must set up special access, and shall not climb the railing.

2, personnel dedicated channel should be determined in the construction organization design. According to the conditions, ladders and ramps (with steps) can be used, and handrails should be set on both sides.

3. In the process of earthwork excavation, the formed foundation pit should be protected with railings in time, and a pedestrian passage should be set up on the edge of the foundation pit to get up and down the foundation pit.

4. The channels must be set in a solid and reliable structure, and the number and location should meet the relevant requirements of DL5009 1-2004 "Safety Work Regulations for Electric Power Construction Part I: Thermal Power Generation".

Sixth, matters needing attention?

1, personnel operation must have a safe foothold, and pay attention to safety, to prevent falling into the foundation pit, scaffolding must comply with the specification, limb protection meets the specification requirements. ?

2, the lighting problems of foundation pit construction, the setting of electric box and the surrounding environment, as well as the erection and use of various electrical equipment should comply with the provisions of the electrical code. ?

7. Safety warning signs?

Signs such as "No entry for non-working personnel, be careful of foundation pit, be careful of collapse, be careful of falling, and wear safety helmet" should be set at the edge of foundation pit.